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DP solves problems with overlapping subproblems and optimal substructure by caching results using memoization or tabulation.
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C# is a strongly typed, object-oriented language on .NET used for web, desktop, games, APIs, and enterprise applications.
Class is reference type stored on heap. Struct is value type usually stored inline/stack and copied by value.
async methods return Task/Task
<
T
. await pauses method until task completes without blocking thread, useful for IO operations.
IEnumerable works in memory. IQueryable builds expression trees and lets providers like EF Core translate queries to SQL.
DI provides dependencies from outside instead of creating them inside class, improving testability and loose coupling.